Got the ESR 310 cylinder on today, and I noticed I can't use my one piece Boyseen Rad Valve and Reed combo, as I bought a new reed boot so that my new 38mm carb will fit.

What reeds should I buy for this 310?

Thansks!

the ones that fit

does that rad valve make any imorovement?

I knew that much, I should buy ones that fit, you are absolutely correct.

Just currious if anyone had any experience with Delta Force, Boyseen, or maybe just a stock cr250 reeds with a 310 kit.

Rad Valve Reeds works great with the stock set up, but won't fit with the bigger carb.

I BLEW MY 310 UP AS A RESULT OF A REED MISSING A SIHT LOAD OF CORNER

I WOULD SAY NEW ONES THAT FIT WOULD BE GOOD TOO. LOL JK. LET US KNOW WHAT YOU GET!!!!

I use a Boyesen rad valve. I think it makes the response very crisp.
It comes with it's own oversized rubber coupler to fit the bigger carbs.

I am not sure, but I think you should be using a 39mm for a 310 if it has been ported and worked on. That 38mm may be a bit small. At least it was for my 310 CT.

If you use the Boyesen rad valve, ask ESR if they recommend using a reed spacer. I doubt it, but it doesn't hurt to ask. Besides, if you use a spacer, get ready for some headaches trying to connect the air box to the carb using the rubber duct.